One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,13,12)(11,14,15,16)(18,23)(19,27)(20,22)(24,26)(25,31)(28,29)(2,5)(6,8)(9,11)(10,14)(12,16)(13,15)(18,24)(23,26)(25,31)(30,32) involution — undirected(1,3)(2,6)(4,7)(5,8)(11,15)(14,16)(17,18,22,26,21,24,20,23)(19,25,29,32,28,31,27,30)(3,7)(6,8)(9,12,13,10)(11,16,15,14)(17,19,21,28)(18,25,24,31)(20,27,22,29)(23,30,26,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.